Solvent-free synthesis of chiral Schiff-base ligands based on ferrocene under microwave irradiation and application to enantioselective nitroaldol (Henry) reaction
作者:Gülşen Öztürk、Mehmet Çolak、Nadir Demirel
DOI:10.1002/chir.20934
日期:2011.5
Chiral Schiff‐bases 3a, 3b, 3c, 3d, 3e, 3f based on ferrocene were designed and synthesized using solvent‐free methods by mixing ferrocene carbaldehyde 1 with amino alcohols and amines 2a, 2b, 2c, 2d, 2e, 2f under microwave irradiation and classical method for the enantioselective nitroaldol (Henry) reaction. The Schiff‐bases were obtained in shorter reaction times and improved yield under microwave
通过将二茂铁甲醛1与氨基醇和胺2a,2b,2c,2d,2e,2f混合在微波下,采用无溶剂方法设计和合成了基于二茂铁的手性席夫碱3a,3b,3c,3d,3e,3f。辐射和经典方法进行对映选择性硝基羟醛(亨利)反应。与传统方法相比,微波辐射法在较短的反应时间内获得了Schiff碱,并提高了收率。在配体3e中观察到最高的对映选择性当使用CH 2 Cl 2作为溶剂时(95%ee)。手性,2011年。©2011 Wiley‐Liss,Inc.。